西藏正式成为中国的一个行政区域，开始于 [ ]
A．唐朝
B．宋朝
C．元朝
D．明朝
答案：C
“What did the teacher tell you to do? ” “I have to write a __ composition.”
A．two-thousand-word
B．two-thousand-word
C．two-thousands-words
D．two-thousand-words
一桶油连桶重350千克，倒出一半后，连桶重200千克，这桶油重多少千克？桶重多少千克？
